# 1971 U.S. Professional Indoor

> tennis tournament

**Wikidata**: [Q4001734](https://www.wikidata.org/wiki/Q4001734)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/1971_Philadelphia_International_Indoor_Open_Championships)  
**Source**: https://4ort.xyz/entity/1971-u-s-professional-indoor